Mobile plethysmographic device

• US 8,974,396 B1
• Filed: 09/14/2014
• Issued: 03/10/2015
• Est. Priority Date: 09/14/2014
• Status: Active Grant

• Current Assignee: Yukka Magic LLC
• Original Assignee: Impact Sports Technologies Incorporated
• Inventors: Hunt, Mark, Brady, Donald, Rulkov, Nikolai
• Primary Examiner(s): Koharski, Christopher D
• Assistant Examiner(s): MAHMOOD, NADIA AHMAD
• Application Number:
  US14/485,770
• Time in Patent Office: 177 Days
• Field of Search: 600/508, 600/509, 600/473
• US Class Current: 600/508
• CPC Class Codes: A61B 5/0022 Monitoring a patient using a global network, e.g. telephone networks, internet
• CPC Class Codes: A61B 5/02028 Determining haemodynamic parameters not otherwise provided for, e.g. cardiac contractility or left ventricular ejection fraction
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/02427 Details of sensor
• CPC Class Codes: A61B 5/681 Wristwatch-type devices
• CPC Class Codes: A61B 5/6824 Arm or wrist
• CPC Class Codes: A61B 5/721 using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured
• CPC Class Codes: A61B 5/7221 Determining signal validity, reliability or quality A61B5/7207 and A61B5/7217 take precedence
• CPC Class Codes: A61B 5/7282 Event detection, e.g. detecting unique waveforms indicative of a medical condition A61B5/4094, A61B5/4818, A61B5/349, A61B5/0823 take precedence

Abstract

A mobile plethysmographic device for detecting a premature atrial contraction event is disclosed herein. The mobile plethysmographic device generates a pleth waveform, which is automatically screened by algorithms that measure the waveform to correlate, detect and store aberrations related to heart anomalies. A premature atrial contraction event for a patient is determined based on an identification of a time interval of the pleth waveform that is below the threshold minimum time interval followed immediately by a time interval that is above the threshold maximum time interval.

Claims

1. A method for determining a premature atrial contraction event for a patient, the method comprising:

measuring a plethysmographic signal for a patient from an optical signal generated by an optical sensor and digitized and processed by a processor, the optical sensor and processor on a mobile plethysmographic device, the plethysmographic signal comprising a plurality of pulse waves, the mobile plethysmographic device comprising a three-axis accelerometer;

identifying at the processor a maximum peak value for each pulse wave of the plurality of pulse waves of the plethysmographic signal to generate a plurality of maximum values of the plethysmographic signal;

calculating at the processor a plurality of time intervals between adjacent maximum values of the plethysmographic signal;

establishing at the processor a threshold minimum time interval and a threshold maximum time interval for the plurality of time intervals; and

determining at the processor a premature atrial contraction event for the patient based on an identification of a time interval that is below the threshold minimum time interval followed immediately by a time interval that is above the threshold maximum time interval

using three axis accelerometer information from the accelerometer to validate the premature atrial contraction event by measuring motion activity and verifying the validity of the premature atrial contraction event when the motion measured by the accelerometer remains less than a preset threshold.

2. The method according to claim 1 further comprising recording the premature

atrial contraction event as a first premature atrial contraction event in a memory of the mobile device.

3. The method according to claim 1 further comprising transmitting the premature

atrial contraction event information from the mobile device to a processing device using a transceiver on the mobile device.

4. The method according to claim 1 further comprising monitoring for movement of

mobile device using an accelerometer to provide a signal for movement of the mobile device.

5. The method according to claim 2 further comprising recording a plurality of

premature atrial contraction events in the memory of the mobile device and accumulating the plurality of premature atrial contraction events for statistical purposes for display on the mobile device or on a remote device transmitted via a transceiver of the mobile device.